20231221010 has 128 divisors (see below), whose sum is σ = 49446028800. Its totient is φ = 5755115520.

The previous prime is 20231220929. The next prime is 20231221013. The reversal of 20231221010 is 1012213202.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20231221013) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 879536 + ... + 902244.

It is an arithmetic number, because the mean of its divisors is an integer number (386297100).

Almost surely, 2^20231221010 is an apocalyptic number.

20231221010 is an abundant number, since it is smaller than the sum of its proper divisors (29214807790).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20231221010 is a wasteful number, since it uses less digits than its factorization.

20231221010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22836.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 20231221010 its reverse (1012213202), we get a palindrome (21243434212).

It can be divided in two parts, 202312 and 21010, that added together give a palindrome (223322).

The spelling of 20231221010 in words is "twenty billion, two hundred thirty-one million, two hundred twenty-one thousand, ten".